src/network/networkd-wait-online-manager.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Tom Gundersen <teg@jklm.no>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <netinet/ether.h>
  21 #include <linux/if.h>
  22 #include <fnmatch.h>
  23
  24 #include "alloc-util.h"
  25 #include "netlink-util.h"
  26 #include "network-internal.h"
  27 #include "networkd-wait-online-link.h"
  28 #include "networkd-wait-online.h"
  29 #include "time-util.h"
  30 #include "util.h"
  31
  32 bool manager_ignore_link(Manager *m, Link *link) {
  33         char **ignore;
  34
  35         assert(m);
  36         assert(link);
  37
  38         /* always ignore the loopback interface */
  39         if (link->flags & IFF_LOOPBACK)
  40                 return true;
  41
  42         /* if interfaces are given on the command line, ignore all others */
  43         if (m->interfaces && !strv_contains(m->interfaces, link->ifname))
  44                 return true;
  45
  46         /* ignore interfaces we explicitly are asked to ignore */
  47         STRV_FOREACH(ignore, m->ignore)
  48                 if (fnmatch(*ignore, link->ifname, 0) == 0)
  49                         return true;
  50
  51         return false;
  52 }
  53
  54 bool manager_all_configured(Manager *m) {
  55         Iterator i;
  56         Link *l;
  57         char **ifname;
  58         bool one_ready = false;
  59
  60         /* wait for all the links given on the command line to appear */
  61         STRV_FOREACH(ifname, m->interfaces) {
  62                 l = hashmap_get(m->links_by_name, *ifname);
  63                 if (!l) {
  64                         log_debug("still waiting for %s", *ifname);
  65                         return false;
  66                 }
  67         }
  68
  69         /* wait for all links networkd manages to be in admin state 'configured'
  70            and at least one link to gain a carrier */
  71         HASHMAP_FOREACH(l, m->links, i) {
  72                 if (manager_ignore_link(m, l)) {
  73                         log_info("ignoring: %s", l->ifname);
  74                         continue;
  75                 }
  76
  77                 if (!l->state) {
  78                         log_debug("link %s has not yet been processed by udev",
  79                                   l->ifname);
  80                         return false;
  81                 }
  82
  83                 if (STR_IN_SET(l->state, "configuring", "pending")) {
  84                         log_debug("link %s is being processed by networkd",
  85                                   l->ifname);
  86                         return false;
  87                 }
  88
  89                 if (l->operational_state &&
  90                     STR_IN_SET(l->operational_state, "degraded", "routable"))
  91                         /* we wait for at least one link to be ready,
  92                            regardless of who manages it */
  93                         one_ready = true;
  94         }
  95
  96         return one_ready;
  97 }
  98
  99 static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 100         Manager *m = userdata;
 101         uint16_t type;
 102         Link *l;
 103         const char *ifname;
 104         int ifindex, r;
 105
 106         assert(rtnl);
 107         assert(m);
 108         assert(mm);
 109
 110         r = sd_netlink_message_get_type(mm, &type);
 111         if (r < 0)
 112                 goto fail;
 113
 114         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
 115         if (r < 0)
 116                 goto fail;
 117
 118         r = sd_netlink_message_read_string(mm, IFLA_IFNAME, &ifname);
 119         if (r < 0)
 120                 goto fail;
 121
 122         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 123
 124         switch (type) {
 125
 126         case RTM_NEWLINK:
 127                 if (!l) {
 128                         log_debug("Found link %i", ifindex);
 129
 130                         r = link_new(m, &l, ifindex, ifname);
 131                         if (r < 0)
 132                                 goto fail;
 133
 134                         r = link_update_monitor(l);
 135                         if (r < 0)
 136                                 goto fail;
 137                 }
 138
 139                 r = link_update_rtnl(l, mm);
 140                 if (r < 0)
 141                         goto fail;
 142
 143                 break;
 144
 145         case RTM_DELLINK:
 146                 if (l) {
 147                         log_debug("Removing link %i", l->ifindex);
 148                         link_free(l);
 149                 }
 150
 151                 break;
 152         }
 153
 154         return 0;
 155
 156 fail:
 157         log_warning_errno(r, "Failed to process RTNL link message: %m");
 158         return 0;
 159 }
 160
 161 static int on_rtnl_event(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 162         Manager *m = userdata;
 163         int r;
 164
 165         r = manager_process_link(rtnl, mm, m);
 166         if (r < 0)
 167                 return r;
 168
 169         if (manager_all_configured(m))
 170                 sd_event_exit(m->event, 0);
 171
 172         return 1;
 173 }
 174
 175 static int manager_rtnl_listen(Manager *m) {
 176         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 177         sd_netlink_message *i;
 178         int r;
 179
 180         assert(m);
 181
 182         /* First, subscribe to interfaces coming and going */
 183         r = sd_netlink_open(&m->rtnl);
 184         if (r < 0)
 185                 return r;
 186
 187         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 188         if (r < 0)
 189                 return r;
 190
 191         r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, on_rtnl_event, m);
 192         if (r < 0)
 193                 return r;
 194
 195         r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, on_rtnl_event, m);
 196         if (r < 0)
 197                 return r;
 198
 199         /* Then, enumerate all links */
 200         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 201         if (r < 0)
 202                 return r;
 203
 204         r = sd_netlink_message_request_dump(req, true);
 205         if (r < 0)
 206                 return r;
 207
 208         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 209         if (r < 0)
 210                 return r;
 211
 212         for (i = reply; i; i = sd_netlink_message_next(i)) {
 213                 r = manager_process_link(m->rtnl, i, m);
 214                 if (r < 0)
 215                         return r;
 216         }
 217
 218         return r;
 219 }
 220
 221 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 222         Manager *m = userdata;
 223         Iterator i;
 224         Link *l;
 225         int r;
 226
 227         assert(m);
 228
 229         sd_network_monitor_flush(m->network_monitor);
 230
 231         HASHMAP_FOREACH(l, m->links, i) {
 232                 r = link_update_monitor(l);
 233                 if (r < 0)
 234                         log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
 235         }
 236
 237         if (manager_all_configured(m))
 238                 sd_event_exit(m->event, 0);
 239
 240         return 0;
 241 }
 242
 243 static int manager_network_monitor_listen(Manager *m) {
 244         int r, fd, events;
 245
 246         assert(m);
 247
 248         r = sd_network_monitor_new(&m->network_monitor, NULL);
 249         if (r < 0)
 250                 return r;
 251
 252         fd = sd_network_monitor_get_fd(m->network_monitor);
 253         if (fd < 0)
 254                 return fd;
 255
 256         events = sd_network_monitor_get_events(m->network_monitor);
 257         if (events < 0)
 258                 return events;
 259
 260         r = sd_event_add_io(m->event, &m->network_monitor_event_source,
 261                             fd, events, &on_network_event, m);
 262         if (r < 0)
 263                 return r;
 264
 265         return 0;
 266 }
 267
 268 int manager_new(Manager **ret, char **interfaces, char **ignore, usec_t timeout) {
 269         _cleanup_(manager_freep) Manager *m = NULL;
 270         int r;
 271
 272         assert(ret);
 273
 274         m = new0(Manager, 1);
 275         if (!m)
 276                 return -ENOMEM;
 277
 278         m->interfaces = interfaces;
 279         m->ignore = ignore;
 280
 281         r = sd_event_default(&m->event);
 282         if (r < 0)
 283                 return r;
 284
 285         sd_event_add_signal(m->event, NULL, SIGTERM, NULL,  NULL);
 286         sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 287
 288         if (timeout > 0) {
 289                 usec_t usec;
 290
 291                 usec = now(clock_boottime_or_monotonic()) + timeout;
 292
 293                 r = sd_event_add_time(m->event, NULL, clock_boottime_or_monotonic(), usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT));
 294                 if (r < 0)
 295                         return r;
 296         }
 297
 298         sd_event_set_watchdog(m->event, true);
 299
 300         r = manager_network_monitor_listen(m);
 301         if (r < 0)
 302                 return r;
 303
 304         r = manager_rtnl_listen(m);
 305         if (r < 0)
 306                 return r;
 307
 308         *ret = m;
 309         m = NULL;
 310
 311         return 0;
 312 }
 313
 314 void manager_free(Manager *m) {
 315         Link *l;
 316
 317         if (!m)
 318                 return;
 319
 320         while ((l = hashmap_first(m->links)))
 321                link_free(l);
 322         hashmap_free(m->links);
 323         hashmap_free(m->links_by_name);
 324
 325         sd_event_source_unref(m->network_monitor_event_source);
 326         sd_network_monitor_unref(m->network_monitor);
 327
 328         sd_event_source_unref(m->rtnl_event_source);
 329         sd_netlink_unref(m->rtnl);
 330
 331         sd_event_unref(m->event);
 332         free(m);
 333
 334         return;
 335 }